The 5790B AC Measurement Standard is a versatile calibration device designed to deliver high precision AC voltage and current measurements, with uncertainties as low as ±24 ppm. It supports a wide voltage range from 600 μV to 1000 V and frequency ranges up to 50 MHz, and simplifies measurements through an intuitive touch screen interface that automates switching and calculations. Additionally, it offers enhanced functionalities for both absolute and relative current measurements, making it suitable for various calibration applications.

1. The easiest way to make
precision ac measurements
5790B
AC Measurement Standard

2. 2222
Precision ac voltage and current
measurements have never been this easy
The expanded 5790B
wideband range extends
its workload to calibrating
50 MHz reference outputs
of RF power meters such as
the Keysight N1914A.
The 5790B AC Measurement
Standard is a multi-purpose
ac measurement and transfer
standard designed for the most
demanding calibration applica-
tions. It combines the accuracy
you would expect from a thermal
transfer standard with the ease
of use of a digital multimeter.
Absolute ac voltage measure-
ment uncertainties are as low
as ± 24 ppm (one year, 23°C
± 5°C). The 5790B is designed to
meet the complete ac voltage, ac
current and wideband verifica-
tion requirements of the Fluke
Calibration 5730A, 5720A, and
5700A Multifunction Calibrators;
5522A, 5502A, 5520A, and
5500A Multi-Product Calibrators;
plus other calibrators, ampli-
fiers like the 52120, 5725A and
5205A/5215A, and transfer stan-
dards and ac voltmeters.
The 5790B covers an alternat-
ing voltage range of 600 μV to
1000 V, and a frequency range of
10 Hz to 1 MHz. Wideband voltage
options extend frequency range to
30 or 50 MHz.
The 5790B in combination with
the Fluke A40B Current Shunts
now allow you to make direct,
absolute or relative current mea-
surements without the need to
perform any calculations.
The 5790B may be used alone
as a measurement device or as a
transfer standard when compared
to an external dc source. In either
case, the normally tedious switch-
ing and calculations are performed
automatically by the 5790B, and
the resulting ac/dc difference is
displayed directly on the easy-to-
read 6.5-inch full-color capacitive
touch screen display.

3. 3
+/- 22.0 ppm (1 year) 30 days since calibration4/20/15 10:52am
Setup
Menu
Pk-Pk Statistics
Current
Shunt
Set
Reference
1 A Shunt #000057885
Input 2
V
1.0000
0.800000
kHz
1.000110 A
Auto Range 2.2 V
+/- 25.0 ppm (1 year) 30 days since calibration4/20/15 10:52am
Pause
Sampling
Stop
Sampling
Standard
Deviation
in V
Back
Input 2
V
100.00
9.99990
Hz
Auto Range 22 V
Minimum:
9.9990 V
Maximum:
10.00002 V
Avgerage:
9.99997 V
Standard
Deviation: 2.30 ppm
SampleSize: 92Max - Min: 1.02 mV
Updated features provide
improvements inside and out
Absolute and relative
current measurement
The Fluke A40B series shunt
resistors provide a very cost
effective method to expand the
5790B’s functionality to measure
absolute and relative ac current
to calibrate an ac current source.
The 5790B’s new user interface
allows you to input and save cur-
rent shunts to its memory. Up to
150 shunts can be stored along
with the shunts’ serial numbers,
calibration constant values (24
ac/dc, five loading error points)
and calibration dates. After the
shunt information is loaded, the
5790B can be set up to take a
direct absolute or relative ac cur-
rent measurement within seconds
by hooking up the shunt and
simply selecting the appropri-
ate shunt from the main menu.
When using a current shunt,
5790B displays both the voltage
and current measurements on
the display along with the shunt
information. Legacy Fluke A40
and A40A current shunts as well
as custom shunts can be loaded
and used to make relative current
measurements.
Expanded wideband
range (50 MHz)
The “/3” wideband input and
function, with ranges of 2.2 mV to
metrology grade cable. It calcu-
lates the measured power with a
50 ohm load.
Statistics and peak-to-
peak waveform functions
Statistics showing number of
samples, standard deviation, aver-
age, min and max are calculated
using the displayed readings as
the basis. As a benefit of the large
touch screen display, the statistics
data can be viewed while the
main measurement is still visible
on the screen.
The 5790B now does peak-
to-peak waveform calculations
for you. You can select one of
four waveforms: sine, square,
triangle, and truncated. Some
of these waveforms are difficult
and time consuming to calcu-
late. The 5790B performs all the
calculations for you based on the
measurement, significantly reduc-
ing time and possible errors.
The Fluke A40B
expands the capa-
bility of the 5790B
to allow you to
make very precise
absolute and
relative current
measurements.
You no longer
need to calculate
the current value,
allowing you to
perform calibra-
tions more quickly
with less potential
for errors.
Left: The current shunt mode allows you to see
the direct, absolute current measurement as well
as the voltage measurement.
Right: The statistics screen provides valuable
information when performing statistical
measurements.
Since its release in 1990, the 5790A has developed an unmatched
reputation of being the most precise ac measurement standard in
the industry. The technology behind the 5790A and the patented
Fluke RMS sensor has made it the measurement standard of choice
for calibration laboratories around the world. The 5790B retains the
innovative technical features of its predecessor, and adds many new
capabilities and functions which expand the capable workload and
reliability of the product.
7 V, 10 Hz to 30 MHz, is retained
from the 5790A model. A new
“/5” wideband option extends the
bandwidth even further, to 10 Hz
to 50 MHz. The expanded wide-
band range extends the workload
of the product to calibrate precision
50 MHz power reference outputs
found on most RF power meters.
Improved specifications
A direct-readout-mode graphical
user interface displays specifi-
cations for measuring common
non-sinusoidal waveforms plus
peak-to-peak computation
(assumes THD <1 %.) This allows
for instantaneous information
when it is needed the most. Unlike
the vacuum fluorescent display
on the 5790A, the new 6.5-inch
capacitive touch screen display
allows you to see more informa-
tion on screen, reducing the need
to switch between menus.
The 5790B now specifies
absolute dc voltage measurement
uncertainties as low as ± 24 ppm
(one year, 23 °C ± 5 °C), provid-
ing more confidence in transfer
measurements.
A dedicated special purpose
50 MHz, 225 mV, 50 ohm input
function is available as an option
for measuring RF power meter
reference outputs. The option is
“spot calibrated” at the end of
a precision level/phase stable

4. 4
Easy-to-use graphical
interface and ergonomic
features
The graphical user interface
features easy-to-read, easy-to-
use menus, as well as access to
common functions with just the
touch of a finger. Quickly select
the range and input using the
hard keys on the front panel. A
bright red status indicator for
HAZARDOUS VOLTAGE is located
on front panel, letting you know
immediately when hazardous volt-
age is present at the terminals.
Like the new 5730A Multi-
Product Calibrator, the front
panel features Visual Connection
Management™ terminals that light
up to show you which terminals
are active, guiding you to make
the correct connections.
Precision you can
depend on
The 5790B is based on the pat-
ented Fluke Solid-State Thermal
RMS Sensor, which has been
proven since 1979 in a variety of
Fluke products like the 792A
AC/DC Transfer Standard. The
Fluke RMS Sensor is a true ther-
mal converter, not an electronic
converter that calculates the RMS
value. Because its output voltage is
2 V rather than the 7 mV to 10 mV
of traditional thermocouples, the
RMS sensor exhibits excellent
signal-to-noise characteristics
and minimal reversal errors. With
a higher output voltage, more
accurate measurements can be
made. And because of its small
size, the RMS sensor stabilizes
quickly and operates over a wide
temperature range.
The 5790B also features her-
metically sealed thin-film resistor
networks to minimize ac measure-
ment errors.
The RMS sensor and thin-film
resistor networks are designed by
Fluke to be rugged and reliable.
Each is built to exacting standards
by the Fluke Microelectronics
Group to maintain quality and
consistency part after part.
Versatility that keeps you
productive
The variety of inputs and con-
nection types allows you to
use the one that best suits your
application. There are four sets
of input terminals on the 5790B,
two Type-N connectors and a set
of five-way binding posts. One
Type-N and one set of binding
posts are dedicated to the ac
The patented Fluke Solid-State
RMS Sensor provides the 5790B
with exceptional accuracy and
stability, and fast settling time.
The 5790B is designed to meet
the ac verification requirements
of the Fluke 5700 Series and
5500 Series calibrators.
Automation using MET/CAL®
Calibration Software is fast
and easy.

5. 5
Traceability to national
standards for the 5790B
is supported through
the Fluke 792A AC/DC
Transfer Standard.
measurement and transfer modes.
AC or dc voltages may be applied
to either input connection over the
5790B’s full range, allowing you
to perform automated ac/dc trans-
fer measurements. The 5790B
determines automatically whether
the applied voltage is ac or dc.
The second Type-N input
connection supports the optional
wideband mode.
The input connection is easily
selected with the touch of a
key on the 5790B front panel.
An LED indicates which terminals
are active.
Whether you are using the
5790B as a voltmeter or a transfer
standard, input voltage and fre-
quency are always indicated
on the measurement display. In
the transfer mode, the ac/dc or
ac/ac difference is always indi-
cated on the control display in
ppm, %, volts or ratio.
Designed with your support
requirements in mind
The 5790B AC Measurement Standard provides
a self-contained calibration procedure designed
to simplify periodic performance verification.
The operator is prompted on what actions to
take. To minimize the equipment required, the
5790B is designed to be supported by the 792A
AC/DC Transfer Standard.
The 5790B is a fully autorang-
ing instrument and it selects the
best voltage range for the mea-
surement you are making. You
may also select and lock in ranges
manually. Robust 1200 V input
protection is active on all voltage
ranges.
Using the trigger keys, the
5790B can switch from continu-
ous to single measurements of the
input voltage, making it easy to
take sample readings at predeter-
mined intervals.
When using the 5790B in
transfer mode, the reference volt-
age is stored, and all ac/dc or ac/
ac difference measurements are
made relative to it. You may also
store the average of two voltages
as a reference to eliminate dc
reversal errors, for example.
The intuitive front panel layout
of the 5790B makes manual oper-
ation fast and simple. Keys and
selections are logically arranged
and labeled. And messages and
menus are displayed clearly on
the 5790B’s bright, touch screen
display.
USB, GPIB/IEEE-488, Ethernet
and RS-232 interfaces are
included and all functions of the
instruments can be controlled by
a PC. The 5790B easily can be
integrated into automated sys-
tems operating with MET/CAL®
Calibration Software. The 5790B
fully replicates the 5790A through
its emulation feature, allowing
you to use the 5790B with legacy
5790A MET/CAL procedures.

6. 6
5790B overview
The wideband
options extend
frequency range to
30 MHz or 50 MHz to
meet the calibration
requirements of
the 5730A, 5700A,
and 5720A Series
Wideband Options.
Capacitive touch
screen display with
easy-to-read, intuitive
menu structure lets
you access any
feature within three
button presses or less.
The A40B series shunts enable
the 5790B to cost effectively
calibrate an ac current source.
Visual Connection
Management™ terminals
light up to indicate active
terminals, helping you
know which connection
to make.
Inputs 1 and 2 allow you to quickly con-
nect and measure up to 1000 V ac or dc. For
maximum versatility, Input 1 is an N-Type
coaxial connector and Input 2 is a standard
dual-terminal binding post.
Hard keys enable you to quickly
select range and change inputs.
A “soft power” switch
allows the product
to be powered on to
keep the components
warmed up, but dis-
ables the functionality
of the 5790B.
A new power switch automatically
senses and adapts to the incoming
mains power and frequency.
Ethernet, RS-232, GPIB
and USB interfaces.

7. 7
Summary specifications
AC and dc voltage Best 99 %, absolute specification: ± 24 ppm (one year, 23 °C ± 5 °C)
Inputs Input 1: 600 μV to 1000 V (5 % over-range)
Input 2: 600 μV to 1000 V (5 % over-range)
Aux input: 250 mV to 500 mV
WB input: <7 V rms wideband
Warm-up time 30 minutes
Relative humidity Operating: 45 % to 50 °C 75 % to 45 °C 95 % to 30 °C
Storage: <95 % non-condensing
Altitude Operating: 3,050 meters (10,000 feet)
Non-operating: 12,200 meters (40,000 feet)
Temperature Operating: 0 °C to 50 °C
Calibration: 15 °C to 35 °C
Storage: -40 °C to 70 °C
Electromagnetic compatibility (EMC)
International IEC 61326-1: Controlled Electromagnetic Environment - CISPR 11: Group 1, Class A
Korea (KCC) Class A Equipment (Industrial Broadcasting & Communication Equipment)
USA (FCC) 47 CFR 15 subpart B. This product is considered an exempt device per clause 15.103.
Surge ANSI C62.41-1980, Category A
Reliability MIL-T-2880D, paragraph 3.13.3
General specifications
Dimensions Height: 17.8 cm (7 in) standard rackmount + 1.5 cm (0.6 in)
Width: 43.2 cm (17 in)
Depth: 63 cm (24.8 in)
Maximum power
requirements
5790B: 100 VA
Weight 5790B: 24 kg (53 lb)
With wideband: 24.5 kg (54 lb)
Line power 50 Hz or 60 Hz; 100 V to 120 V, 220 V to 240 V 100 V, 110 V, 115 V, 120 V, 200 V, 220 V, 230 V, 240 V
Safety Complies with UL1244 and IEC 348-1976 and IEC 1010 and CSA C22.2 No. 231 and ANSI/ISA S82
Remote interfaces RS-232, IEEE-488
Confidence level 99 % unless otherwise specified
5790B/AF
The 5790B/AF has enhanced absolute accuracy to ± 0.23 % of voltage (1 year after factory calibration, 23 °C ±3 °C, at 95 % confidence
level) at 50 MHz and 223.61 mV, using a serialized one meter cable, characterized at that point for RF power meter 0 dBm reference out-
put measurement. In the RF power measurement mode, the accuracy is specified to the end of the serialized cable with a curve fit for the
other ranges and frequencies that is a first order correction for cable loss.

8. Fluke Calibration
PO Box 9090,
Everett, WA 98206 U.S.A.
Fluke Europe B.V.
PO Box 1186, 5602 BD
Eindhoven, The Netherlands
For more information call:
In the U.S.A. (877) 355-3225 or Fax (425) 446-5116
In Europe/M-East/Africa +31 (0) 40 2675 200 or Fax +31 (0) 40 2675 222
In Canada (800)-36-FLUKE or Fax (905) 890-6866
From other countries +1 (425) 446-5500 or Fax +1 (425) 446-5116
Web access: http://www.flukecal.com
©2015 Fluke Calibration. Specifications subject to change without notice.
Printed in U.S.A. 6/2015 6005013a-en
Pub-ID 13403-eng
Modification of this document is not permitted without written permission
from Fluke Calibration.
Fluke Calibration. Precision, performance, confidence.™
Ordering Information
Models
5790B AC Measurement Standard
5790B/3 AC Measurement Standard
+30 MHz Wideband Option
5790B/5 AC Measurement Standard
+ 50 MHz Wideband Option
5790B/AF AC Measurement Standard
+ 50 MHz Wideband Option
Calibrated with WB cable
Accessories
5790B/5 WB Cable Cable, 50 ohm Wideband Cable
for RF Power Measurements
A40B/Set Complete set of A40B shunts,
transit case and accessories
A40B-001MA 1 milliamp Current Shunt
A40B-010MA 10 milliamp Current Shunt
A40B-020MA 20 milliamp Current Shunt
A40B-050MA 50 milliamp Current Shunt
A40B-100mA 100 milliamp Current Shunt
A40B-200mA 200 milliamp Current Shunt
A40B-500mA 500 milliamp Current Shunt
A40B-1A 1 amp Current Shunt
A40B-2A 2 amp Current Shunt
A40B-5A 5 amp Current Shunt
A40B-10A 10 amp Current Shunt
A40B-20A 20 amp Current Shunt
A40B-50A 50 amp Current Shunt
A40B-100A 100 amp Current Shunt
A40B-LEAD/4MM Cable N-Type Connector to
Dual Terminal Plugs
A40B-LEAD/N Cable N-Type Connector to
N-Type Connector
57XX/CASE Transit Case for 57XXA Series
Y5737 5790B and 5700A/5720A
Rack Mount Kit. Includes
24 in. slides that allow for
side ventilation
The broadest range
of calibration solutions
Fluke Calibration provides the broadest range of cali-
brators and standards, software, service, support and
training in electrical, temperature, pressure, RF and
flow calibration.
Visit www.flukecal.com for more information about
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